EP2869048A1 - Torque sensing device - Google Patents

Torque sensing device Download PDF

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Publication number
EP2869048A1
EP2869048A1 EP20140170734 EP14170734A EP2869048A1 EP 2869048 A1 EP2869048 A1 EP 2869048A1 EP 20140170734 EP20140170734 EP 20140170734 EP 14170734 A EP14170734 A EP 14170734A EP 2869048 A1 EP2869048 A1 EP 2869048A1
Authority
EP
European Patent Office
Prior art keywords
torque
sensing device
strain gauge
set forth
pedal shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20140170734
Other languages
German (de)
English (en)
French (fr)
Inventor
Myung Geun Oh
Geun Ho Lee
Se Joo Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electro Mechanics Co Ltd
Original Assignee
Samsung Electro Mechanics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electro Mechanics Co Ltd filed Critical Samsung Electro Mechanics Co Ltd
Publication of EP2869048A1 publication Critical patent/EP2869048A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
    • B62J45/411—Torque sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
    • B62J45/40—Sensor arrangements; Mounting thereof
    • B62J45/42—Sensor arrangements; Mounting thereof characterised by mounting
    • B62J45/421—Sensor arrangements; Mounting thereof characterised by mounting at the pedal crank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/45—Control or actuating devices therefor
    • B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/108—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving resistance strain gauges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot

Definitions

  • the present invention relates to a torque sensing device.
  • a bicycle is configured so that a front wheel which is a steering wheel and a rear wheel which is a driving wheel are straightly disposed on the front and back of a frame, and a rider works a pedal which is interlocked with the rear wheel to drive the rear wheel, thereby moving forward.
  • the bicycle is installed with a power transmission apparatus such as a chain, a gear, or the like which transmits power generated from the pedal to the rear wheel.
  • a power transmission apparatus of a chain type is composed of a driving sprocket installed on one side of the pedal, a passive sprocket having a diameter smaller than that of the driving sprocket and installed on the rear wheel which is the driving wheel, and a chain connecting the driving sprocket and the passive sprocket to each other.
  • the above-mentioned bicycle is driven using pedal effort generated by pedaling of a user.
  • the user has no difficulty in driving the bicycle on a flat land, but needs to use much of his/her power when going up a slope way such as a hill, or the like.
  • an electric bicycle having a motor mounted therein has been recently developed so as to be driven using driving power from the motor in addition to the pedal effort of the user.
  • the electric bicycle uses the motor which is driven by a battery.
  • This electric bicycle is configured to be able to select a drive by only power generated by the pedaling of person, a drive by only power of the motor which is driven by the battery, or a drive using both of them.
  • An electric bicycle according to the prior art has a torque sensor mounted on a pedal shaft to thereby automatically adjust driving power of the motor according to a signal output from the torque sensor when going up the hill.
  • Examples of the torque sensor include a magnetic type in which when a torsion sensor coil generates a magnetic field according to torsion, an inductor senses the magnetic field and generates a voltage, and a strain gauge type in which a torsion sensor is mounted between the pedal and a crank to measure the torsion.
  • Torque is essentially a measure of sensing torsion of a shaft. Since an amount of torsion is very slight, it is required to precisely amplify the amount of torsion.
  • the torque sensor when the torque sensor is mounted on the bicycle, it occupies much mounting space and a plurality of parts need to be mounted, thereby making installation and maintenance difficult.
  • Patent Document 1 Korean Patent Laid-Open Publication No. 2012-0132593
  • the present invention has been made in an effort to provide a torque sensing device sensing pedal torque of a pedal shaft of an electric bicycle.
  • a torque sensing device including: a torque measuring part formed on an outer peripheral surface of a pedal shaft of a bicycle; a strain gauge sensing torque of the pedal shaft by a torsion measurement by the torque measuring part; and a connecting part electrically connecting the strain gauge and a controlling part to each other in order to transmit a torque value sensed by the strain gauge to the controlling part.
  • the torque measuring part may have both sides which are coupled to the pedal shaft and the central side positioned at a distance spaced apart from the pedal shaft.
  • the torque measuring part may have coupling grooves formed at both sides thereof and corresponding to coupling protrusions formed on the pedal shaft.
  • the torque sensing device may further include an amplifying part amplifying the torque value measured by the strain gauge.
  • the amplifying part may be positioned between the strain gauge and the connecting part to transmit the amplified torque value to the connecting part.
  • the torque sensing device may further include an insulating part positioned on an outer surface of the torque measuring part to insulate between the torque measuring part and the connecting part.
  • the insulating part may insulate between the torque measuring part and the amplifying part.
  • the connecting part may include: a slip ring provided along an outer surface of the insulating part; and a brush contacting the slip ring.
  • the strain gauge may include a lead wire electrically connected to the amplifying part.
  • Three slip rings may be provided in a ring form along an outer peripheral surface of the insulating part, and the amplifying part may include three connecting wires connected to the three slip rings, respectively.
  • the insulating part may insulate between the lead wire and the connecting wire, and the pedal shaft.
  • a torque sensing device including: a strain gauge sensing torque of a pedal shaft of a bicycle; and a connecting part electrically connecting the strain gauge and a controlling part to each other in order to transmit a torque value sensed by the strain gauge to the controlling part.
  • the torque sensing device may further include an amplifying part amplifying the torque value measured by the strain gauge.
  • the amplifying part may be positioned between the strain gauge and the connecting part to transmit the amplified torque value to the connecting part.
  • the torque sensing device may further include an insulating part positioned on an outer surface of the pedal shaft to insulate between the pedal shaft and the connecting part.
  • the insulating part may insulate between the pedal shaft and the amplifying part.
  • the connecting part may include: a slip ring provided along an outer surface of the insulating part; and a brush contacting the slip ring.
  • the strain gauge may include a lead wire electrically connected to the amplifying part.
  • Three slip rings may be provided in a ring form along an outer peripheral surface of the insulating part, and the amplifying part may include three connecting wires connected to the three slip rings, respectively.
  • the insulating part may insulate between the lead wire and the connecting wire, and the pedal shaft.
  • Two strain gauges, two connecting parts, two insulating parts, and two amplifying parts may be provided and may be each positioned at both sides of the pedal shaft.
  • FIG. 1 is a perspective view showing a torque sensing device according to a preferred embodiment of the present invention
  • FIG. 2 is a perspective view of a main component showing the torque sensing device according to the preferred embodiment of the present invention
  • FIG. 3 is an illustration view showing the torque sensing device according to the preferred embodiment of the present invention.
  • a torque sensing device 100 is configured to include a torque measuring part 110, a strain gauge 120, and a connecting part 140, thereby sensing torque of a pedal shaft 10.
  • the torque sensing device 100 may further include an amplifying part 150 and an insulating part 130.
  • FIG. 4 is a perspective view showing a torque measuring part in the torque sensing device according to the preferred embodiment of the present invention
  • FIG. 5 is a cut-away perspective view showing the torque measuring part in the torque sensing device according to the preferred embodiment of the present invention.
  • the torque measuring part 110 is formed on an outer peripheral surface of the pedal shaft 10 of the bicycle and is provided to easily measure torque.
  • the torque measuring part 110 has both sides which are coupled to the pedal shaft 10 and the central side positioned at a distance spaced apart from the pedal shaft 10 by a predetermined interval. Therefore, referring to FIGS. 3 and 5 , only both sides of the torque measuring part 110 contact the pedal shaft 10, such that torsion of the pedal shaft 10 may be easily measured by the strain gauge 120 measuring a deformation amount. As a result, a torque value of the pedal shaft 10 may be sensed by the measured torsion.
  • the torque measuring part 110 has a plurality of coupling protrusions 11 formed on an outer surface of the pedal shaft 10 contacting both sides thereof and coupling grooves 111a formed at both sides of the torque measuring part 110 and corresponding to the coupling protrusions 11 formed on the pedal shaft 10, thereby making it possible to easily measure the torque of the pedal shaft 10.
  • the torque measuring part 110 is formed in a pair so as to each contact both sides of the pedal shaft 10.
  • the torque measuring part 110 may be configured to include a first torque measuring part 111 and a second torque measuring part 112, wherein the first torque measuring part 111 may have a plurality of fixed protrusions 111b formed on an outer peripheral surface thereof and the second torque measuring part 112 may be provided with fixed grooves 112b having a form corresponding to the plurality of fixed protrusions 111b.
  • the strain gauge 120 senses the torque of the pedal shaft 10 of the bicycle.
  • the strain gauge 120 may measure the torsion of the pedal shaft 10 by measuring the deformation amount of the pedal shaft 10 and sense the torque of the pedal shaft 10 based on the measured torsion.
  • the strain gauge 120 may be positioned on the outer peripheral surface of the torque measuring part 110 to thereby sense the torque of the pedal shaft 10 by the torque measuring part 110.
  • the pedal shaft 10 has pedals 20 provided at both sides thereof. When a user works the pedals 20, the strain gauge 120 senses the torque acting on the pedal shaft 10, such that force in which the user works the pedals 20 may be estimated.
  • strain gauge 120 may include a lead wire 121 electrically connected to the amplifying part 150 or the connecting part 140 so as to transmit the torque sensed value.
  • the amplifying part 150 may amplify the torque value sensed by the strain gauge 120.
  • the amplifying part 150 may include a connecting wire 151 electrically connected to the connecting part 140 so as to transmit the amplified torque value.
  • three connecting wires 151 may be provided.
  • the insulating part 130 is positioned on the outer surface of the pedal shaft 10 to thereby electrically insulate between the pedal shaft 10 and the connecting part 140.
  • the insulating part 130 may insulate between the pedal shaft 10 and the amplifying part 150.
  • the insulating part 130 may insulate between the lead wire 121 of the strain gauge 120 and the connecting wire 151 of the amplifying part 150, and the pedal shaft 10, but the present invention is not limited thereto.
  • the connecting part 140 may provide a connection part electrically connecting the strain gauge 120 and a controlling part (not shown) to each other so that the torque value sensed by the strain gauge 120 may be transmitted to the controlling part.
  • the connecting part 140 may include a slip ring 141 provided along an outer surface of the insulating part 130 and a brush 142 contacting the slip ring 141.
  • the slip ring 141 may be provided in a circular form along an outer peripheral surface of the insulating part 130.
  • the slip ring 141 is rotated and the brush 142 is fixed.
  • one side of the brush 142 contacts an outer surface of the slip ring 141 which is co-rotated at the time of the rotation of the petal shaft 10, and the other side thereof is electrically connected to the controlling part.
  • three slip rings 141 may be provided so as to be disposed at a predetermined interval along a length direction of the pedal shaft 10.
  • the three slip rings 141 may be each electrically connected to the three connecting wires 151 of the amplifying part 150.
  • FIG. 6 is an illustration view showing a torque sensing device according to another preferred embodiment of the present invention.
  • a torque sensing device 200 is configured to include a strain gauge 220 and a connecting part 240, thereby sensing torque of the pedal shaft 10.
  • the torque sensing device 200 according to another preferred embodiment of the present invention has a configuration that the torque measuring part 110 is omitted from the torque sensing device 100 according to a preferred embodiment of the present invention.
  • the strain gauge 220 senses a torque of the pedal shaft 10 of the bicycle.
  • the strain gauge 220 may measure torsion of the pedal shaft 10 by measuring a deformation amount of the pedal shaft 10 and sense the torque of the pedal shaft 10 based on the measured torsion.
  • strain gauge 220 may include a lead wire 221 electrically connected to an amplifying part 250 or the connecting part 240 so as to transmit the torque sensed value.
  • the amplifying part 250 may amplify the torque value sensed by the strain gauge 220.
  • the amplifying part 250 may include a connecting wire 251 electrically connected to the connecting part 240 so as to transmit the amplified torque value.
  • three connecting wires 251 may be provided.
  • An insulating part 230 is positioned on an outer surface of the pedal shaft 10 to thereby electrically insulate between the pedal shaft 10 and the connecting part 240.
  • the insulating part 230 may insulate between the pedal shaft 10 and the amplifying part 250.
  • the insulating part 230 may insulate between the lead wire 221 of the strain gauge 220 and the connecting wire 251 of the amplifying part 250, and the pedal shaft 10, but the present invention is not limited thereto.
  • the connecting part 240 may provide a connection part electrically connecting the strain gauge 220 and a controlling part to each other so that the torque value sensed by the strain gauge 220 may be transmitted to the controlling part.
  • the connecting part 240 may include a slip ring 241 provided along an outer surface of the insulating part 230 and a brush 242 contacting the slip ring 241.
  • the slip ring 241 may be provided in a circular form along an outer peripheral surface of the insulating part 230.
  • three slip rings 241 may be provided so as to be disposed at a predetermined interval along a length direction of the pedal shaft 10.
  • the three slip rings 241 may be each electrically connected to the three connecting wires 251 of the amplifying part 250.
  • the strain gauge 220, the connecting part 240, and the insulating part 230, and the amplifying part 250 may be provided in a pair so as to be each positioned at both sides of the pedal shaft 10. Therefore, the torque of the pedal shaft 10 may be more precisely measured.
  • the use of the expensive torque sensor may be replaced by sensing the pedal torque of the pedal shaft using the strain gauge, thereby making it possible to decrease use cost.
  • the cost may be significantly decreased and the space occupied by the torque sensor may be decreased.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
EP20140170734 2013-10-23 2014-06-02 Torque sensing device Withdrawn EP2869048A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130126673A KR20150046990A (ko) 2013-10-23 2013-10-23 토크 검출장치

Publications (1)

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EP2869048A1 true EP2869048A1 (en) 2015-05-06

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EP20140170734 Withdrawn EP2869048A1 (en) 2013-10-23 2014-06-02 Torque sensing device

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EP (1) EP2869048A1 (zh)
KR (1) KR20150046990A (zh)
CN (1) CN104554597A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019148045A1 (en) * 2018-01-26 2019-08-01 Michael Grassi Shaft minimizing ellipticalization strain error
US10479445B2 (en) 2017-10-03 2019-11-19 PalTorc, Inc. Smart crank control for E-bike

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101774436B1 (ko) 2015-07-24 2017-09-05 주식회사 금화피에스시 발전기 베어링 토크 측정 장치 및 토크 측정용 거치대
KR102370522B1 (ko) * 2017-06-09 2022-03-07 주식회사 만도 전기 자전거용 휠 모터 조립체

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263992B1 (en) * 1999-08-17 2001-07-24 Shu-Shian Li Torque detection device
EP1978342A2 (en) * 2007-04-02 2008-10-08 CAMPAGNOLO S.r.l. Instrument-equipped bicycle component and detection unit for equipping such a component
CN201737127U (zh) * 2010-04-16 2011-02-09 美尔顿车业(东莞)有限公司 一种电动助力自行车踏力感测系统
KR20120132593A (ko) 2011-05-26 2012-12-06 금오공과대학교 산학협력단 태양 전지를 이용한 전기자전거
US20130024137A1 (en) * 2011-07-18 2013-01-24 Grassi Michael J Torque sensor
CN202807025U (zh) * 2012-08-22 2013-03-20 久鼎金属实业股份有限公司 电动自行车的踏力感测机构

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923683A4 (en) * 2005-09-07 2013-10-16 Yamaha Motor Co Ltd ROTATION DETECTOR AND TORQUE SENSOR
JP5479436B2 (ja) * 2011-11-07 2014-04-23 日本電産コパル株式会社 トルク検出装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6263992B1 (en) * 1999-08-17 2001-07-24 Shu-Shian Li Torque detection device
EP1978342A2 (en) * 2007-04-02 2008-10-08 CAMPAGNOLO S.r.l. Instrument-equipped bicycle component and detection unit for equipping such a component
CN201737127U (zh) * 2010-04-16 2011-02-09 美尔顿车业(东莞)有限公司 一种电动助力自行车踏力感测系统
KR20120132593A (ko) 2011-05-26 2012-12-06 금오공과대학교 산학협력단 태양 전지를 이용한 전기자전거
US20130024137A1 (en) * 2011-07-18 2013-01-24 Grassi Michael J Torque sensor
CN202807025U (zh) * 2012-08-22 2013-03-20 久鼎金属实业股份有限公司 电动自行车的踏力感测机构

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10479445B2 (en) 2017-10-03 2019-11-19 PalTorc, Inc. Smart crank control for E-bike
WO2019148045A1 (en) * 2018-01-26 2019-08-01 Michael Grassi Shaft minimizing ellipticalization strain error
US11390346B2 (en) 2018-01-26 2022-07-19 Michael Grassi Shaft minimizing ellipticalization strain error

Also Published As

Publication number Publication date
KR20150046990A (ko) 2015-05-04
CN104554597A (zh) 2015-04-29

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